音圈电机推力迟滞特性研究

The thrust control accuracy was reduced by the hysteresis characteristic of the voice coil motor (VCM) and the pressure accuracy of a valve controlled by VCM is restricted. In order to achieve the precise thrust control of VCM, a thrust hysteresis model based on Preisach model was proposed. The feasibility of the model was verified by experiment. An inverse hysteresis model of VCM was established and an open-loop inverse compensator was designed. The thrust experiments of VCM with inverse compensator and without inverse compensator were carried out. The results indicate that the hysteresis loop of VCM with inverse compensator is significantly smaller than VCM without the compensator. The maximum absolute error of VCM with inverse compensator is 0.2 N, and relative error is basically maintained within 3%. That of VCM without inverse compensator reaches 0.75 N, and relative error varies greatly. The magnitude of change in the thrust absolute error after compensation is reduced by 73%. The hysteresis characteristic of the thrust of VCM is effectively compensated by the inverse compensator, and the thrust control accuracy is improved.